The present subject matter provides a layered article for sealing an opening in a package for a high alcohol content product. The layered article has a facestock, a reclosure adhesive, a machine direction oriented film, and a sealing adhesive. The sealing adhesive provides a good long-term seal for the package that is resistant to degradation from alcohol. The machine direction oriented film provides an alcohol barrier between the product and the reclosure adhesive. Upon opening, the film tears clean and straight in the machine direction to allow a portion of the film to stay in contact with the package and another portion of the film to be pulled from the package to expose the opening. The reclosure adhesive provides resealing capabilities for the layered article after the initial opening of the package. The clean straight tear also provides a tamper evident feature for the package.
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1. A layered article to seal an opening in a package for a high alcohol content product comprising:
a facestock,
a reclosure adhesive disposed on the facestock,
a machine direction oriented film disposed on the reclosure adhesive, with at least one cut-out at a periphery of the film that is in line with a machine direction of the film,
a sealing adhesive disposed on the film and having an adhesive strength that is not significantly diminished by the product, for adhering the layered article to the package;
wherein an initial peeling of the layered article from the package causes the film to tear from said at least one cut-out, in the machine direction of the film, forming a peeled portion of the layered article that is peeled from the package and exposes the opening, and forming a remaining portion of the layered article that is retained on the package, and
wherein the machine direction oriented film has a reclosure surface, in the remaining portion of the layered article, to which the reclosure adhesive is adapted to bond to reseal the opening.
21. A container for a high alcohol content product comprising:
a package, having an opening;
a layered article sealing the opening comprising
a facestock,
a reclosure adhesive disposed on the facestock,
a machine direction oriented film disposed on the reclosure adhesive, with at least one cut-out at a periphery of the film that is in line with a machine direction of the film,
a sealing adhesive disposed on the film, having an adhesive strength that is not significantly diminished by the product, for adhering the layered article to the package; and
wherein initially peeling the layered article from the package causes the film to tear from said at least one cut-out, in the machine direction of the film, forming
a peeled portion of the layered article that is peeled from the package and exposes the opening, the peeled portion of the layered article comprising the facestock, the reclosure adhesive, a peeled portion of the film, and a peeled portion of the sealing adhesive, and
a remaining portion of the layered article that is retained on the package, the remaining portion of the layered article comprising a remaining portion of the film and a remaining portion of the sealing adhesive and
wherein the machine direction oriented film has a reclosure surface, in the remaining portion of the layered article, to which the reclosure adhesive is adapted to bond to release the opening.
41. A container for a high alcohol content product comprising:
a package, having an opening cover defined by one or more weakened regions,
a layered article, adhered to the package over the opening cover, comprising
a facestock,
a reclosure adhesive disposed on the facestock,
a machine direction oriented film disposed on the reclosure adhesive, with at least one cut-out at a periphery of the film that is in line with a machine direction of the film,
a sealing adhesive disposed on the film, having an adhesive strength that is not significantly diminished by the product, for adhering the layered article to the package; and
wherein initially peeling the layered article from the package causes the film to tear from said at least one cut-out, in the machine direction of the film, forming
a peeled portion of the layered article that is peeled from the package, the peeled portion of the layered article comprising the facestock, the reclosure adhesive, a peeled portion of the film, and a peeled portion of the sealing adhesive, the peeled portion of the sealing adhesive at least partially separates the opening cover from the package to thereby form an opening in the package, and
a remaining portion of the layered article that is retained on the package, the remaining portion of the layered article comprising a remaining portion of the film and a remaining portion of the sealing adhesive and
wherein the machine direction oriented film has a reclosure surface, in the remaining portion of the layered article, to which the reclosure adhesive is adapted to bond to reseal the opening.
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The present application claims priority to International Application No. PCT/CN2012/080154 filed Aug. 15, 2012, which is incorporated herein by reference in its entirety.
The present subject matter relates to a layered adhesive article used as a reclosure sealing label. The layered article is advantageously used for sealing packages that contain wet product that have high alcohol content. The layered article is also used as a tamper-evident sealing label. The present subject matter also relates to packages that incorporate the layered article.
Reclosure adhesive layered articles, also known as sealing labels, are one typical adhesive functional application which requires performance characteristics that enable the sealing label to be removed and resealed to the packaging, for example, from 1 to 150 times. Typically, the number of items contained in a package correlates to the number of times reclosure is required. If a single use/serving product is provided in a package, then the resealing capabilities of a layered article may only need to provide 1 to 3 reclosures. This situation is illustrative of resealable containers for dry pasta, bread, candy, or the like. Other situations may require a greater number of reclosures, i.e. 10 to 20 reclosures or even 50 to 150 reclosures. Examples of these are travel tissue containers, frozen vegetable containers, sliced meat containers, and the like.
The adhesive used to reseal a layered article to a container must have a certain level of resistance to degradation from the product in the container. This level of resistance to the package contents must increase as the number of required reclosures increases because the adhesive is presumably in proximity to the contents for a longer period of time. This increase in product resistance of the adhesive ensures proper reclosures of the container and prevents loss of adhesion. Loss of adhesion could cause product contamination, product degradation, or exposure to environmental elements.
Of particular importance is the resealing capability of layered articles that seal containers for “wet” products. By “wet” it is meant a product that contains an amount of moisture (being water, alcohol, or other liquid medium) that may decrease the adhesion of the layered article to the container, such as wet tissue or wet wipes. Wet products are one of the most challenging applications in the reclosure market because they can reduce the bond strength of an adhesive. Good content resistance is necessary for wet sealing layered articles because normally, about 50 to about 150 reclosures are required.
Typical wet sealing labels comprise a film facestock, a reclosure adhesive, and a release liner for production and handling purposes. The above structure has adequate performance for wet products that are free of alcohol content. But for wet product with high concentrations of alcohol, this type of reclosure adhesive has poor alcohol resistance and therefore has poor resealing capabilities. The bonding strength of the typical sealing label will decrease due to alcohol corrosion to the adhesive. Furthermore, as a result of alcohol evaporation, the functional component in the content formulation of the adhesive could migrate away from the layered article and package interface.
Problems associated with typical sealing labels, as applied to high alcohol content wet product, can lead to an improper seal that fails to maintain the integrity of the packaging. Over time, an improper seal can cause degradation of the high alcohol content wet product. Degradation can include evaporation of the liquid component of the product which produces a dry item not suitable for its intended purpose.
Therefore, a need exists to have a layered article that provides proper adhesion for high alcohol content wet products.
The difficulties and drawbacks associated with previously known reclosure sealing labels and strategies are overcome in the present layered article and container.
The present subject matter relates to a layered article used for sealing and re-closing packages that contain product that has high alcohol content. The layered article provides a tamper-evident feature for visual indication that the package has been initially opened. The present subject matter also relates to containers that incorporate the layered article.
In one aspect, the present subject matter provides a layered article to seal an opening in a package for a high alcohol content product. The layered article comprises a facestock, a reclosure adhesive, a machine direction oriented (hereinafter “MDO”) film, and a sealing adhesive for adhering the layered article to the package and having an adhesive strength that is not significantly diminished by the product. When the layered article is initially peeled back from the package, the MDO film tears in the machine direction of the MDO film, thus forming a peeled portion of the layered article and a remaining portion of the layered article. The peeled portion of the layered article is peeled from the package and exposes the opening. The remaining portion of the layered article is retained on the package.
In another aspect, the present subject matter provides a container for a high alcohol content product. The container comprises a package having an opening, a layered article sealing the opening including a facestock, a reclosure adhesive, an MDO film, and a sealing adhesive for adhering the layered article to the package and having an adhesive strength that is not significantly diminished by the product. When the layered article is initially peeled back from the package, the MDO film tears in the machine direction of the MDO film, thus forming a peeled portion of the layered article and a remaining portion of the layered article. The peeled portion of the layered article is peeled from the package and exposes the opening and comprises the facestock, the reclosure adhesive, a peeled portion of the film, and a peeled portion of the sealing adhesive. The remaining portion of the layered article is retained on the package and comprises a remaining portion of the film and a remaining portion of the sealing adhesive.
The preferred layered article provides a good seal over an opening in a package for a high alcohol content product. The layered article has good resistance to alcohol, provides reclosure capabilities of about 50 to about 150 times, and provides strong sealing adhesion that reduces the risk of packaging blast failure during high-temperature and/or long-term transportation or storage.
As will be realized, the subject matter described herein is capable of other and different embodiments and its several details are capable of modifications in various respects, all without departing from the claimed subject matter. Accordingly, the drawings and description are to be regarded as illustrative and not restrictive.
These, as well as other features, aspects, and advantages of the present subject matter, will be more completely understood and appreciated by referring to the following more detailed description of the exemplary embodiments of the present subject matter in conjunction with the accompanying drawings.
The subject matter described herein provides a layered article to seal an opening in a package for a high alcohol content product. The layered article has the capability of reclosing the package more than about 50 times and as many as about 150 times. The layered article also provides a tamper-evident feature. A related container for a high alcohol content product, incorporating the sealing layered article, is also provided.
By “alcohol” it is meant an organic compound in which the hydroxyl functional group (—OH) is bound to a carbon atom. In particular, this carbon atom should be saturated, having single bonds to three other atoms. These compounds include monohydric alcohols such as isopropyl alcohol, methanol, ethanol, propanol, butanol, and the like; polydydric alcohols such as ethylene glycol, glycerin, erythritol, zylitol, sorbitol, mannitol and the like; unsaturated aliphatic alcohols such as allyl alcohol, geraniol, propargyl alcohol and the like; and alicyclic alcohols such as inositol, menthol and the like.
By “high alcohol content product” it is meant a product containing about 5% by weight of alcohol and up to about 70% by weight of alcohol. For example, alcohol based wet tissue/wet wipes are in this category.
A preferred embodiment of the present subject matter is a layered article to seal an opening in a package for a high alcohol content wet product. The layered article comprises a facestock; a reclosure adhesive disposed on the facestock; a machine direction oriented film disposed on the reclosure adhesive, with at least one cut-out at a periphery of the film that is in line with a machine direction of the film; and a sealing adhesive disposed on the film having an adhesive strength that is not significantly diminished by the product, for adhering the layered article to the package. The layered article is such that peeling the layered article from the package causes the film to tear, beginning from the cut-outs and continuing in the machine direction of the film, thereby forming a peeled portion of the layered article and a remaining portion of the layered article. The peeled portion of the layered article is peeled from the package and exposes the opening. The remaining portion of the layered article is retained on the package. The layered article can many times re-seal the opening by releasably adhereing the peeled portion of the layered article to the remaining portion of the layered article as discussed in more detail herein.
Another preferred embodiment of the present subject matter is a container for a high alcohol content wet product. The container comprises a package, having an opening; a layered article for covering the opening, including a facestock, a reclosure adhesive disposed on the facestock, a machine direction oriented film disposed on the reclosure adhesive, with at least one cut-out at a periphery of the film that is in line with a machine direction of the film, a sealing adhesive disposed on the film having an adhesive strength that is not significantly diminished by the product, for adhering the layered article to the package. The layered article is such that peeling the layered article from the package causes the film to tear, beginning from the cut-outs and continuing in the machine direction of the film, thereby forming a peeled portion of the layered article and a remaining portion of the layered article. The peeled portion of the layered article is peeled from the package and exposes the opening and comprises the facestock, the reclosure adhesive, a peeled portion of the film, and a peeled portion of the sealing adhesive. The remaining portion of the layered article is retained on the package and comprises a remaining portion of the film and a remaining portion of the sealing adhesive. The layered article can many times re-seal the opening by releasably adhering the reclosure adhesive to the remaining portion of the film as discussed in more detail herein
The layered article of present subject matter displays good resistance to alcohol and provides a strong bond to the package. The present subject matter includes a sealing adhesive and MDO film that provide a barrier to alcohol in the product. The sealing adhesive is such that its bond strength is not significantly reduced by the alcohol present in the product. The strong bond between the layered article and the package is sustained over time to maintain the integrity of the package. The maintained integrity of the package preserves the product, extends the shelf-life of the product, and minimizes the risk of packaging blast failure during high-temperature and/or long term transportation and storage. The reclosure adhesives of typical wet sealing labels degrade when exposed to alcohol and package blast failure is a normal occurrence for packages housing high alcohol content product.
The present subject matter also utilizes the MDO film to physically separate the reclosure adhesive from the high alcohol content wet product. The reclosure adhesive is thereby protected from alcohol degradation and its reclosure capabilities and bond strength is maintained.
After the initial opening of a container, the layered article will provide a good seal upon reclosure and provide reclosure capabilities of about 50 to about 150 times or more. The reclosure adhesive maintains a releasable and resealable bond because it is not subject to significant degradation by the alcohol. Alcohol evaporation from the product is thus minimized and the product remains wet and suited for its intended use. In the case of high alcohol content wet tissue, the yet unused wet tissue remaining in the container retains its alcohol content over the life-span of the product.
These and other aspects are described in greater detail herein as follows.
The layered articles in accordance with the present subject matter can be used to seal openings in flexible containers such as pouches, and in rigid containers such as trays. The layered articles themselves can be flexible, rigid, or semi-rigid material or combinations thereof. Preferably, the layered articles have no scoring, perforations, or the like within their construction that would allow degradation of the product.
In reference to the Figures, identically numbered features indicate similar characteristics present in each embodiment. Now looking to
Now looking to
In a preferred embodiment, the layered article of the present subject matter comprises a sealing label. The sealing label is printable or has printing, images, or other indicia on or visible from the exposed side.
Facestock
In accordance with the present subject matter, the layered article comprises a facestock. The facestock of the layered article can comprise a single or multi-layered film, foil, fabric, paper, sheet, or combinations or laminations thereof, all of which are substantially two-dimensional objects having a first and second side. By substantially two-dimensional, it is meant an object having a significantly large size measurement in two dimensions compared to a significantly small size measurement in the third dimension. Alternatively, the facestock can comprise a three-dimensional object. The composition of the facestock, whether two-dimensional or three-dimensional, is not particularly limited and can comprise metal, paper, polymers, textiles, glass, ceramic, wood, or combinations thereof. Non-limiting examples of preferred facestock components are polypropylene, polyethylene, polyethylene terephthalate or combinations or blends thereof. The polymeric components of the facestock can be machine direction oriented, transverse direction oriented, or biaxially oriented.
The facestock of the present subject matter is preferably comprised of a thin polymeric elastic or flexible film formed from a pliable elastomer material. A preferred facestock comprises at least one layer that is biaxially oriented and more preferably comprises a layer of biaxially oriented polypropylene. The biaxially oriented film of the preferred facestock will be more resistant to tearing, ripping, or otherwise being damaged during peeling of the layered article from the package than a non-oriented film.
The film is continuous in that it has no perforations or pores which extend through the thickness of the film. The facestock preferably has a thickness from about 10 microns to about 100 microns, and more preferably has a thickness of about 50 microns.
The facestock can optionally include other layers or coatings for specific intended uses including printing receptive layers or coatings, hydrophobic layers or coatings, additional facestock layers, or the like. The facestock may optionally be coated on either surface.
In one aspect of the present subject matter, the facestock is at least partially transparent or translucent. That is, the facestock is not completely opaque, thus allowing underlying layers of the layered article to be observed or visible through the facestock. As will be discussed in further detail herein, when the facestock is not completely opaque, the MDO film will be observable through the facestock.
In a preferred embodiment a portion of the facestock comprises the exposed side of the layered article and can be printable or contain printing, images, or other indicia. The other side of the facestock preferably has the reclosure adhesive disposed thereon. Upon peeling the layered article from the package, the facestock preferably remains essentially intact and does not rip, tear, or otherwise become damaged.
Reclosure Adhesive
In accordance with the present subject matter, the layered article comprises a reclosure adhesive. The reclosure adhesive of the present subject matter preferably comprises a removable and resealable adhesive for resealing the layered article to the package. In one preferred aspect the reclosure layer comprises a pressure-sensitive adhesive (hereinafter “PSA”). The reclosure adhesive is preferably not completely opaque. That is, the reclosure adhesive is at least partially transparent or translucent, thus allowing underlying layers to be observable through the reclosure adhesive. As will be discussed in further detail herein, when the reclosure adhesive is not completely opaque, the MDO film will be observable through the reclosure adhesive.
Pressure-sensitive adhesives are adhesives that bond to a substrate with the application of pressure. Solvents, water, chemical reaction, or heat are not required to activate the adhesive. The degree of bonding strength is influenced by the amount of pressure which is used to apply the adhesive to the surface. Bonding strength is also affected by substrate characteristics such as smoothness, surface energy, presence of contaminants, and the like. Pressure-sensitive adhesives are usually designed for use at room temperature. They normally display a total or partial loss of bonding strength at low temperatures and shear holding ability at high temperatures.
Pressure-sensitive adhesives exhibit viscoelastic properties, which are tailored to ensure proper adhesion. Pressure-sensitive adhesives are designed to balance their tendency to flow (adhesive forces) and their resistance to flow (cohesive forces). Pressure-sensitive adhesives form a bond to a surface because their adhesive forces are such that they flow, or wet the substrate. The bond maintains strength because the cohesive forces of the pressure-sensitive adhesive are such that they resist flow when stress is applied to the bond.
Once the substrate and the pressure-sensitive adhesive are in proximity, there are also molecular interactions, such as van der Waals forces involved in the bond, which contribute significantly to the bond strength.
Pressure-sensitive adhesives are usually composed of elastomeric polymers with or without tackifiers. A variety of polymers have been used to manufacture pressure-sensitive adhesives; for example, acrylic and methacrylic ester homo- or copolymers, butyl rubber-based systems, silicones, nitriles, styrene block copolymers, ethylene-vinyl acetate, urethanes, vinyl esters and amides, olefin copolymer materials, natural or synthetic rubbers, and the like.
Pressure-sensitive adhesives are typically classified in one of two categories, permanent and removable. Permanent pressure-sensitive adhesives are adhesives which do not allow for the removal of an adhesive article from a substrate without considerable damage to the adhesive article, adhesive failure at the article surface, cohesive failure in the body of the adhesive, or residual transfer of the adhesive to the substrate.
The adhesion of removable pressure-sensitive adhesives is considerably lower, allowing removal of the adhesive article from the substrate even after a protracted period of contact. Removal is accomplished without significant damage to the adhesive article or substrate. Removable pressure-sensitive adhesives form a temporary bond and can be removed without leaving any residue on the substrate. Removable PSAs can often be removed from and resealed to a substrate multiple times without significant loss of adhesion between each resealing and removal.
A preferred embodiment for the reclosure adhesive of the present subject matter comprises a removable and resealable, acrylic based solvent pressure-sensitive adhesive that provides resealing capabilities from about 50 to about 150 times or more. An example of a preferred reclosure adhesive is SR101 provided by Avery Dennison Corporation, 150 North Orange Grove Boulevard, Pasadena, Calif. 91103-3596, USA. The SR101 adhesive is a removable acrylic based solvent pressure-sensitive adhesive featuring excellent die cutting, strip performance and UV resistance suitable for use on packages with low moisture content. Another example of a preferred reclosure adhesive is SR106 also provided by Avery Dennison Corporation. The SR106 adhesive is a removable acrylic based solvent pressure-sensitive adhesive with excellent die cutting, strip performance, and UV resistance suitable for use on packages with high moisture content. Regardless of the type of adhesive used for the reclosure adhesive, it is preferably protected from significant degradation from the alcohol in the product by the MDO film and sealing adhesive. Therefore, the reclosure adhesive does not necessarily have to be resistant to alcohol, but can be.
Other adhesives can be used; such as a polyurethane adhesive, a rubber adhesive, or the like. The adhesive layer should have a glass transition temperature less than about 10° C. below use temperature, typically less than about 30° C. below use temperature. As used herein, the phrase “use temperature” is the temperature at which the adhesive is normally bonded to a substrate. Use temperature is normally ambient (25°) but may be 0° C. or less for low temperature applications and higher than 25° C. for high temperature applications. The copolymers for the adhesive of the instant subject matter can be stabilized against UV and oxidative degradation by using UV stabilizers and antioxidants. Fillers, colorants, tackifiers, plasticizers, oils, and the like, may also be added.
Upon peeling the layered article from the package, the reclosure adhesive preferably remains essentially as a cohesive layer disposed on the facestock and does not separate, rip, tear, or otherwise become significantly damaged. The reclosure adhesive will provide a substantial portion of the resealing function for the layered article. The reclosure adhesive will remain affixed to the facestock of the layered article during each removal and resealing and separate from a portion of the MDO film as is discussed in greater detail herein.
The reclosure adhesive preferably has a thickness from about 5 microns to about 50 microns, and more preferably has a thickness from about 15 microns to about 25 microns.
The PSA layer can be disposed on one side of the facestock in a fashion suitable for a particular application. For example, the PSA can be disposed over portions of one side of the facestock or over the entire one side of the facestock. The coating of PSA disposed on the facestock can be patterned, continuous, or applied as discrete islands of adhesive. The PSA layer can have relative uniform thickness or can vary in thickness. In a preferred embodiment, the PSA is disposed in a continuous layer with relative uniform thickness on one entire side of a substantially two-dimensional facestock. In an alternative embodiment, the PSA is disposed on a portion of one side of a substantially two-dimensional facestock.
Machine Direction Oriented Film
The MDO film is preferably a substantially two-dimensional polymer film that is oriented in a machine direction having a first and second side. The MDO film is disposed on a side of the reclosure adhesive opposite the facestock.
Polymer films are typically produced using either a cast or blowing process, which produce optically cloudy films that are very flexible and conformable. After a plastic film has been formed, it can be stretched using basically two different methods—machine-direction orientation or transverse-direction orientation. By combining the above mentioned orientation processes it is also possible to produce bi-axially oriented films. Through the machine direction orientation process, the film is uni-axially oriented in the machine direction of the web. Stretching in the machine direction is normally accomplished via heated rolls that pull the film with gradually increasing speed. The film is brought to a sufficient temperature and is stretched in the machine direction. The film is then rapidly cooled to set the orientation of the film.
It is well known that orientation of plastic films enhances their properties, particularly mechanical, barrier and optical properties. The orientation process generally increases mechanical properties of the films, such as stiffness as measured by Young's modulus and tensile strength; but also improves optical properties such as clarity, haze and gloss. MDO films have good conformability due to the fact that orientation is only carried out in the machine direction. Good conformability in plastic films for label products allows labeling without wrinkles to the surface of packages, which is often significantly curved in two directions.
The orientation process may also produce a reduction of the tear resistance along the machine direction. This decrease in tear resistance along the machine direction is advantageously utilized in the present subject matter by incorporating the MDO film in the layered article such that the machine direction is in line with the direction of the peel for the layered article. Thus the peeling of the layered article from a package produces a tear along the machine direction of the MDO film. A straight clean tear is produced in the MDO film without the need for scoring, perforation, or the like. Therefore, the MDO film has no apertures, holes, or pores which extend through the thickness of the film prior to the initial opening. A continuous barrier between the high alcohol content wet product and the reclosure adhesive is provided before the initial opening of the container. The continuous barrier MDO film thereby prevents alcohol degradation of the reclosure adhesive. The MDO film preferably has a sealing adhesive disposed on a side opposite the reclosure adhesive, for bonding the layered article to the package.
The MDO film can be opaque or transparent or translucent. In one aspect, the MDO film preferably includes printing, images, or other indicia. When the facestock and reclosure adhesive are not completely opaque, the printing, images, and other indicia on the MDO film can be seen through the facestock and reclosure adhesive. When the facestock and reclosure adhesive are not totally opaque, the clean tear in the MDO film that is produced upon peeling the layered article from the package, will be seen through the facestock and reclosure adhesive. The clean tear in the MDO film being observable through the facestock and reclosure adhesive, provides visual indication that the layered article has been initially peeled from the package. Any misalignment of the printing on the MDO film will also be seen upon re-adhering the layered article to the package.
Referring now to
The MDO film 6 has a tab part 21 that is preferably free from the sealing adhesive and at least partially comprises the tab of the layered article. The tab part 21 is preferably on the same end/side of the MDO film 6 as are the cuts-outs 20. The tab part 21 (indicated by cross-hatching lines) is free from the sealing adhesive so that the tab of the layered article does not adhere to the package. This allows the tab of the layered article to be easily grasped and pulled by a user to peel the layered article from the package to open the package. The tab part 21 is preferably in line with the machine direction 8 of the MDO film 6. The tab part 21 can be recessed (as in
When peeled from a package by the tab part 21, the MDO film 6 tears, beginning at the one or more cut-outs 20, and extending in the machine direction 8 along tear lines 24. In conjunction with the cut-outs 20, the tab part 21 at least partially determines the location and direction of the clean tear in the MDO film 6.
The location of the clean tear in the MDO film is at least partially controlled by incorporating one or more cut-outs 20 in the MDO film. The cut-outs can be slits, voids, notches, perforations, or the like, preferably at a periphery of the MDO film and in the machine direction. Alternatively, the cut-outs 20 can begin inside the periphery of the MDO film 6. The shape of the cut-outs are not particularly limited and non-limiting examples are depicted in
When peeled from the package, the MDO film tears along tear lines 24. The peeled portion 25 of the MDO film 6 between the tear lines 24 is pulled from the package with the facestock and the reclosure adhesive. When the peeled portion 25 is pulled away from the package, the sealing adhesive that bonds the peeled portion 25 to the package is also pulled away to expose the opening 22. The remaining portion 26 of the MDO film 6 on either side of tear lines 24, remains bonded to the package with the sealing adhesive, thus forming a reclosure surface to be discussed in more detail herein.
Preferably, the tear lines 24 are formed in the MDO film 6 at a position beyond the opening edge 23 of the opening 22 as shown in
The clean straight tear of the MDO film also provides a tamper-evident function for the layered article. When torn, the MDO film creates a visible indication that the layered article has been initially peeled from the package. When the facestock and the reclosure adhesive are not completely opaque, the clean tear is visually observed through the facestock and reclosure adhesive. It is also contemplated that the clean tear in the MDO film will be noticeable underneath the facestock and reclosure adhesive even if the facestock and reclosure adhesive are totally opaque. When the layered article is re-adhered to the package, the clean tear in the MDO film will produce a bulge, a crease, a deformation, or the like in the layered article that is visually observed even though not seen through the totally opaque facestock and reclosure adhesive.
The MDO film can also preferably includes means to prevent a complete detachment of the peeled portion of the film from the remaining portion of the film. The means are preferably at or near an end of the MDO film distal to the cut-outs and tab part. The means can be a heat seal between the MDO film and the facestock. When the facestock is biaxially oriented, the facestock will provide resistance to tearing past the heat seal. Also possible is a cut-through in the MDO film. The cut-through can be a hook design, a portion of which is substantially perpendicular to the clean tear in the MDO film, in the plane of the substantially two-dimensional MDO film. The cut-through will provide an end point for the clean tear. Also possible is a permanent adhesive to bind the MDO film to the facestock. Like the heat seal, the permanent adhesive will provide resistance to tearing in the MDO film. Other means, well known in the art can be used and these examples are not meant to be limiting to the present subject matter. When the MDO film is prevented from completely separating into two or more pieces, so too is the layered article. Thus the layered article will not separate into two or more pieces when peeled from a package to expose the opening.
Discussed herein is the use of a film, oriented in the machine direction. Also contemplated by the present subject matter is the use of transverse direction oriented film. The same objectives are accomplished by placing the tab part 21 and the one or more cut-outs 20 in line with the transverse direction of the film and incorporating a means to prevent the MDO film from separating into two or more pieces near an edge distal to the cut-outs and tab part.
Sealing Adhesive
The layered article of the present subject matter preferably includes a sealing adhesive. The sealing adhesive provides the means for bonding the layered article to the package and comprises the package contacting layer of the layered article. The sealing adhesive provides a long-term seal for a container to protect against package blast failure, reclosure adhesive degradation, reclosure adhesive migration, and the like. Thus, the alcohol content of the product and the reclosure capabilities of the reclosure adhesive are maintained. The sealing adhesive preferably is resistant to corrosion from alcohol.
The sealing adhesive is preferably a pressure-sensitive adhesive as discussed herein and more preferably, a pure acrylic based removable pressure-sensitive adhesive having a bond strength that is not significantly diminished by the high alcohol content product. By “not significantly diminished” it is meant an adhesive that, when exposed to a high alcohol content product, is able to provide a sufficient seal with the package so that the product within the container does not dry out or otherwise degrade during the life span of the product, thus keeping the product in a state suitable for its intended use.
The composition of a preferred sealing adhesive is not particularly limited except that the sealing adhesive is resistant to alcohol, i.e. has a bond strength that is not significantly diminished by alcohol from the product. In a preferred embodiment, the sealing adhesive provides a strong bond to the package that is minimally degraded by the alcohol from the wet product.
The sealing adhesive is preferably releasable and resealable. A preferred embodiment sealing adhesive maintains at least a portion of its initial bond strength after the initial opening of the package. The sealing adhesive should maintain good adhesion when resealed to the package after initial opening to avoid drying of the product.
Also contemplated by the present subject matter is an adhesive that loses a substantial portion of its bond strength after the initial opening. In this aspect, the reclosure adhesive provides the adhesion to reseal the layered article to cover the opening and prevent the product from drying.
The sealing adhesive preferably completely covers the opening. That is, the sealing adhesive extends beyond the edge of the opening when the layered article is adhered to the package.
In one embodiment, the sealing adhesive has a greater adhesive strength than the reclosure adhesive. When the reclosure adhesive provides the majority of adhesion to reseal the layered article to the package, subsequent peeling of the layered article from the package requires less force than the initial peeling of the layered article.
The sealing adhesive preferably has a thickness from about 5 microns to about 50 microns, and more preferably has a thickness from about 15 microns to about 25 microns.
As previously discussed herein, the sealing adhesive is disposed on the MDO film layer to bond the layered article to the package. Referring to previously described
Release Liner
In a preferred embodiment of the present subject matter, the layered article has a release liner. The release liner is removed prior to applying the layered article to the package. The release liner provides protection for the sealing adhesive and prevents premature exposure of the sealing adhesive to a package, and prevents contamination by dirt, liquids, or other elemental exposure. Inadvertent contact or exposure to environmental elements can decrease the tackiness of the sealing adhesive and prevent the desired adhesion. The release liner maintains the adhesive tackiness of the sealing adhesive.
The release liner also allows for handling of the layered article prior to application to a package, i.e. during lamination, converting, packaging, printing, handling, shipping, and other manufacturing processes. The release liner may also provide stiffness to the layered article to facilitate these steps. The release liner may cover all or a portion of the sealing adhesive.
Typical materials used for the release liner in accordance with the present subject matter are super calandered kraft paper, glassine, clay coated kraft paper, machine finished kraft paper, machine glazed paper, biaxially oriented polyethylene terephthalate film, polypropylene film, polyethylene film, biaxially oriented polypropylene film, polyester, acrylic, nylon, cellulosic derivative, butylene; isobutylene; high, medium, low, and linear low density polyethylene; ethylene vinyl acetate; ethylene acrylic add; ethylene methyl (meth)acrylate; ethylene butyl acrylate; polypropylene; ethylene/propylene copolymers; and impact resistant ethylene/propylene copolymers and combinations thereof.
In a preferred embodiment, the release liner comprises polyethylene terephthalate or a glassine release liner. The thickness of the release liner is not particularly limited and can range from about 5 microns to about 200 microns.
The present subject matter also includes containers for high alcohol content wet product. The containers of the present subject matter include a package and incorporate the layered article as previously described; such description being incorporated herein.
In one aspect of the present subject matter, a container for a high alcohol content product is provided. The preferred container of the present subject matter comprises a package having an opening and a layered article for sealing the opening. The layered article includes a facestock; a reclosure adhesive disposed on the facestock; a machine direction oriented film disposed on the reclosure adhesive, with at least one cut-out at a periphery of the film that is in line with the machine direction of the film; a sealing adhesive disposed on the film having an adhesive strength that is not significantly diminished by the product, for adhering the layered article to the package; and wherein initially peeling the layered article from the package causes the film to tear from said at least one cut-out, in the machine direction of the film. The tear in the MDO film forms a peeled portion of the layered article that is peeled from the package and exposes the opening, and forms a remaining portion of the layered article that is retained on the package. The peeled portion of the layered article comprises the facestock, the reclosure adhesive, a peeled portion of the film, and a peeled portion of the sealing adhesive. The remaining portion of the layered article comprises a remaining portion of the film and a remaining portion of the sealing adhesive.
The package of the preferred embodiment container is not particularly limited and can be rigid, semi-rigid, flexible, or a combination thereof. The composition of the package can comprise polymeric material, metal, paper, fabric, or combinations thereof that are either coated to enhance alcohol resistance and provide alcohol barrier properties or free of such coatings. Non-limiting examples for the composition of the preferred package are polypropylene, polyethylene (including low density, linear low density, medium density, and high density polyethylene), polyethylene terephthalate, polyester, nylon, or combinations, blends, and laminates thereof. The polymeric components of the package can be machine direction oriented, transverse direction oriented, or biaxially oriented, and can be metalized and have sealant additive and coatings. The package can be printable or comprise printing, images, or other indicia on an exposed surface.
Regardless of the form or composition chosen for the package, the preferred embodiment container ensures that the high alcohol content product housed within is properly contained prior to the initial opening, i.e. that the alcohol does not significantly escape from the container allowing the product to dry out. Proper containment of the product is provided when a suitable seal is made between the package and the layered article and when the container itself is properly sealed.
In one aspect of the present subject matter, the package is a flexible polymeric film pouch. Examples of this type of package are the flexible containers used to hold wet tissue/wet wipes usually formed from a sheet of polymeric film that has been bonded to itself with a longitudinal fin seal and two transverse end seals. Other sealing arrangements are contemplated and well known in the art.
The package of the present subject matter has an opening that is sealed by the layered article. The opening in the package can be pre-formed or created when the layered article is peeled from the package by pulling away an opening cover portion of the package. The opening cover can be formed from the package material itself and can be defined by perforations, a score line, a cut-though, bending, stamping, a three dimensional impression, or similar weakened region of the package. Alternatively, the opening cover can be distinct from the package.
When the layered article 1 is peeled from the package 32 by use of the tab 9, the MDO film 6 tears. The tear begins at two cut-outs 20 on either side of the tab part 21, and continues in the machine direction 8 of the MDO film 6. The tear forms a peeled portion 42 of the layered article 1 and a remaining portion 43 of the layered article 1. The peeled portion 42 is peeled from the package 32 and exposes the opening 22. The remaining portion 43 is retained on the package.
The peeled portion 42 of the layered article 1 comprises the facestock 4, the reclosure adhesive 5, a peeled portion 25 of the MDO film 6, and a peeled portion 40 of the sealing adhesive 7. The peeled portion 40 of the sealing adhesive 7 is shown partially revealing the opening 22 in the package 32 that is defined by an opening edge 23. The peeled portion 40 of the sealing adhesive 7 and the peeled portion 26 of the MDO film 6 cover opening 22 and extend beyond the opening edge 23 of the opening 22. The opening 22 is shown to be formed in the package 32 as the peeled portion 40 of the sealing adhesive 7 pulls away an opening cover 30 from the package 32. The opening cover 30 is shown to be formed from the package 32 material.
The remaining portion 43 of the layered article 1 remains bonded to the package and comprises a remaining portion 26 of the MDO film 6 and a remaining portion 41 of the sealing adhesive 7. The remaining portion 26 of the MDO film has a reclosure surface 31 to which the reclosure adhesive 5 can bond to reseal the opening 22 in the container 33. In a preferred embodiment, the reclosure adhesive 5, along with the peeled portion 40 of the sealing adhesive 7 combine to provide adhesion to reseal the opening 22 in the container 33.
The peeled portion 42 of the layered article 1 is prevented from completely detaching or separating from the remaining portion 43 of the layered article 1 by means of heat seals 44 fashioned in a hook design, that are in line with the tear in the MDO film 6.
As discussed previously herein, the clean straight tear of the MDO film 6 also provides a tamper-evident function for the layered article 1. When the facestock 4 and reclosure adhesive 5 are not totally opaque, the tear in the MDO film is visible through the facestock 6 and reclosure adhesive 5. Other tamper-evident features can optionally be incorporated into the layered article 1, package 32, or container 33.
The container and layered article of the present subject matter provide a good initial seal for high alcohol content wet product that is resistant to alcohol degradation and reduces the likelihood of package blast failure. The container and layered article also provide good resealing capabilities and reduce the likelihood of the product drying out during the lifespan of the product.
Many other benefits will no doubt become apparent from future application and development of this technology.
As described hereinabove, the present subject matter solves many problems associated with previous strategies, systems and/or devices. However, it will be appreciated that various changes in the details, materials and arrangements of components, which have been herein described and illustrated in order to explain the nature of the present subject matter, may be made by those skilled in the art without departing from the principle and scopes of the claimed subject matter, as expressed in the appended claims.
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